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Synapse-Cortex / Synapse-Cortexv2 / .venv / Lib / site-packages / PIL / BmpImagePlugin.py
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# The Python Imaging Library. # $Id$ # # BMP file handler # # Windows (and OS/2) native bitmap storage format. # # history: # 1995-09-01 fl Created # 1996-04-30 fl Added save # 1997-08-27 fl Fixed save of 1-bit images # 1998-03-06 fl Load P images as L where possible # 1998-07-03 fl Load P images as 1 where possible # 1998-12-29 fl Handle small palettes # 2002-12-30 fl Fixed load of 1-bit palette images # 2003-04-21 fl Fixed load of 1-bit monochrome images # 2003-04-23 fl Added limited support for BI_BITFIELDS compression # # Copyright (c) 1997-2003 by Secret Labs AB # Copyright (c) 1995-2003 by Fredrik Lundh # # See the README file for information on usage and redistribution. # from __future__ import annotations import os from typing import IO, Any from . import Image, ImageFile, ImagePalette from ._binary import i16le as i16 from ._binary import i32le as i32 from ._binary import o8 from ._binary import o16le as o16 from ._binary import o32le as o32 # # -------------------------------------------------------------------- # Read BMP file BIT2MODE = { # bits => mode, rawmode 1: ("P", "P;1"), 4: ("P", "P;4"), 8: ("P", "P"), 16: ("RGB", "BGR;15"), 24: ("RGB", "BGR"), 32: ("RGB", "BGRX"), } USE_RAW_ALPHA = False def _accept(prefix: bytes) -> bool: return prefix.startswith(b"BM") def _dib_accept(prefix: bytes) -> bool: return i32(prefix) in [12, 40, 52, 56, 64, 108, 124] # ============================================================================= # Image plugin for the Windows BMP format. # ============================================================================= class BmpImageFile(ImageFile.ImageFile): """Image plugin for the Windows Bitmap format (BMP)""" # ------------------------------------------------------------- Description format_description = "Windows Bitmap" format = "BMP" # -------------------------------------------------- BMP Compression values COMPRESSIONS = {"RAW": 0, "RLE8": 1, "RLE4": 2, "BITFIELDS": 3, "JPEG": 4, "PNG": 5} for k, v in COMPRESSIONS.items(): vars()[k] = v def _bitmap(self, header: int = 0, offset: int = 0) -> None: """Read relevant info about the BMP""" assert self.fp is not None read, seek = self.fp.read, self.fp.seek if header: seek(header) # read bmp header size @offset 14 (this is part of the header size) file_info: dict[str, bool | int | tuple[int, ...]] = { "header_size": i32(read(4)), "direction": -1, } # -------------------- If requested, read header at a specific position # read the rest of the bmp header, without its size assert isinstance(file_info["header_size"], int) header_data = ImageFile._safe_read(self.fp, file_info["header_size"] - 4) # ------------------------------- Windows Bitmap v2, IBM OS/2 Bitmap v1 # ----- This format has different offsets because of width/height types # 12: BITMAPCOREHEADER/OS21XBITMAPHEADER if file_info["header_size"] == 12: file_info["width"] = i16(header_data, 0) file_info["height"] = i16(header_data, 2) file_info["planes"] = i16(header_data, 4) file_info["bits"] = i16(header_data, 6) file_info["compression"] = self.COMPRESSIONS["RAW"] file_info["palette_padding"] = 3 # --------------------------------------------- Windows Bitmap v3 to v5 # 40: BITMAPINFOHEADER # 52: BITMAPV2HEADER # 56: BITMAPV3HEADER # 64: BITMAPCOREHEADER2/OS22XBITMAPHEADER # 108: BITMAPV4HEADER # 124: BITMAPV5HEADER elif file_info["header_size"] in (40, 52, 56, 64, 108, 124): file_info["y_flip"] = header_data[7] == 0xFF file_info["direction"] = 1 if file_info["y_flip"] else -1 file_info["width"] = i32(header_data, 0) file_info["height"] = ( i32(header_data, 4) if not file_info["y_flip"] else 2**32 - i32(header_data, 4) ) file_info["planes"] = i16(header_data, 8) file_info["bits"] = i16(header_data, 10) file_info["compression"] = i32(header_data, 12) # byte size of pixel data file_info["data_size"] = i32(header_data, 16) file_info["pixels_per_meter"] = ( i32(header_data, 20), i32(header_data, 24), ) file_info["colors"] = i32(header_data, 28) file_info["palette_padding"] = 4 assert isinstance(file_info["pixels_per_meter"], tuple) self.info["dpi"] = tuple(x / 39.3701 for x in file_info["pixels_per_meter"]) if file_info["compression"] == self.COMPRESSIONS["BITFIELDS"]: masks = ["r_mask", "g_mask", "b_mask"] if len(header_data) >= 48: if len(header_data) >= 52: masks.append("a_mask") else: file_info["a_mask"] = 0x0 for idx, mask in enumerate(masks): file_info[mask] = i32(header_data, 36 + idx * 4) else: # 40 byte headers only have the three components in the # bitfields masks, ref: # https://msdn.microsoft.com/en-us/library/windows/desktop/dd183376(v=vs.85).aspx # See also # https://github.com/python-pillow/Pillow/issues/1293 # There is a 4th component in the RGBQuad, in the alpha # location, but it is listed as a reserved component, # and it is not generally an alpha channel file_info["a_mask"] = 0x0 for mask in masks: file_info[mask] = i32(read(4)) assert isinstance(file_info["r_mask"], int) assert isinstance(file_info["g_mask"], int) assert isinstance(file_info["b_mask"], int) assert isinstance(file_info["a_mask"], int) file_info["rgb_mask"] = ( file_info["r_mask"], file_info["g_mask"], file_info["b_mask"], ) file_info["rgba_mask"] = ( file_info["r_mask"], file_info["g_mask"], file_info["b_mask"], file_info["a_mask"], ) else: msg = f"Unsupported BMP header type ({file_info['header_size']})" raise OSError(msg) # ------------------ Special case : header is reported 40, which # ---------------------- is shorter than real size for bpp >= 16 assert isinstance(file_info["width"], int) assert isinstance(file_info["height"], int) self._size = file_info["width"], file_info["height"] # ------- If color count was not found in the header, compute from bits assert isinstance(file_info["bits"], int) if not file_info.get("colors", 0): file_info["colors"] = 1 << file_info["bits"] assert isinstance(file_info["palette_padding"], int) assert isinstance(file_info["colors"], int) if offset == 14 + file_info["header_size"] and file_info["bits"] <= 8: offset += file_info["palette_padding"] * file_info["colors"] # ---------------------- Check bit depth for unusual unsupported values self._mode, raw_mode = BIT2MODE.get(file_info["bits"], ("", "")) if not self.mode: msg = f"Unsupported BMP pixel depth ({file_info['bits']})" raise OSError(msg) # ---------------- Process BMP with Bitfields compression (not palette) decoder_name = "raw" if file_info["compression"] == self.COMPRESSIONS["BITFIELDS"]: SUPPORTED: dict[int, list[tuple[int, ...]]] = { 32: [ (0xFF0000, 0xFF00, 0xFF, 0x0), (0xFF000000, 0xFF0000, 0xFF00, 0x0), (0xFF000000, 0xFF00, 0xFF, 0x0), (0xFF000000, 0xFF0000, 0xFF00, 0xFF), (0xFF, 0xFF00, 0xFF0000, 0xFF000000), (0xFF0000, 0xFF00, 0xFF, 0xFF000000), (0xFF000000, 0xFF00, 0xFF, 0xFF0000), (0x0, 0x0, 0x0, 0x0), ], 24: [(0xFF0000, 0xFF00, 0xFF)], 16: [(0xF800, 0x7E0, 0x1F), (0x7C00, 0x3E0, 0x1F)], } MASK_MODES = { (32, (0xFF0000, 0xFF00, 0xFF, 0x0)): "BGRX", (32, (0xFF000000, 0xFF0000, 0xFF00, 0x0)): "XBGR", (32, (0xFF000000, 0xFF00, 0xFF, 0x0)): "BGXR", (32, (0xFF000000, 0xFF0000, 0xFF00, 0xFF)): "ABGR", (32, (0xFF, 0xFF00, 0xFF0000, 0xFF000000)): "RGBA", (32, (0xFF0000, 0xFF00, 0xFF, 0xFF000000)): "BGRA", (32, (0xFF000000, 0xFF00, 0xFF, 0xFF0000)): "BGAR", (32, (0x0, 0x0, 0x0, 0x0)): "BGRA", (24, (0xFF0000, 0xFF00, 0xFF)): "BGR", (16, (0xF800, 0x7E0, 0x1F)): "BGR;16", (16, (0x7C00, 0x3E0, 0x1F)): "BGR;15", } if file_info["bits"] in SUPPORTED: if ( file_info["bits"] == 32 and file_info["rgba_mask"] in SUPPORTED[file_info["bits"]] ): assert isinstance(file_info["rgba_mask"], tuple) raw_mode = MASK_MODES[(file_info["bits"], file_info["rgba_mask"])] self._mode = "RGBA" if "A" in raw_mode else self.mode elif ( file_info["bits"] in (24, 16) and file_info["rgb_mask"] in SUPPORTED[file_info["bits"]] ): assert isinstance(file_info["rgb_mask"], tuple) raw_mode = MASK_MODES[(file_info["bits"], file_info["rgb_mask"])] else: msg = "Unsupported BMP bitfields layout" raise OSError(msg) else: msg = "Unsupported BMP bitfields layout" raise OSError(msg) elif file_info["compression"] == self.COMPRESSIONS["RAW"]: if file_info["bits"] == 32 and ( header == 22 or USE_RAW_ALPHA # 32-bit .cur offset ): raw_mode, self._mode = "BGRA", "RGBA" elif file_info["compression"] in ( self.COMPRESSIONS["RLE8"], self.COMPRESSIONS["RLE4"], ): decoder_name = "bmp_rle" else: msg = f"Unsupported BMP compression ({file_info['compression']})" raise OSError(msg) # --------------- Once the header is processed, process the palette/LUT if self.mode == "P": # Paletted for 1, 4 and 8 bit images # ---------------------------------------------------- 1-bit images if not (0 < file_info["colors"] <= 65536): msg = f"Unsupported BMP Palette size ({file_info['colors']})" raise OSError(msg) else: padding = file_info["palette_padding"] palette = read(padding * file_info["colors"]) grayscale = True indices = ( (0, 255) if file_info["colors"] == 2 else list(range(file_info["colors"])) ) # ----------------- Check if grayscale and ignore palette if so for ind, val in enumerate(indices): rgb = palette[ind * padding : ind * padding + 3] if rgb != o8(val) * 3: grayscale = False # ------- If all colors are gray, white or black, ditch palette if grayscale: self._mode = "1" if file_info["colors"] == 2 else "L" raw_mode = self.mode else: self._mode = "P" self.palette = ImagePalette.raw( "BGRX" if padding == 4 else "BGR", palette ) # ---------------------------- Finally set the tile data for the plugin self.info["compression"] = file_info["compression"] args: list[Any] = [raw_mode] if decoder_name == "bmp_rle": args.append(file_info["compression"] == self.COMPRESSIONS["RLE4"]) else: assert isinstance(file_info["width"], int) args.append(((file_info["width"] * file_info["bits"] + 31) >> 3) & (~3)) args.append(file_info["direction"]) self.tile = [ ImageFile._Tile( decoder_name, (0, 0, file_info["width"], file_info["height"]), offset or self.fp.tell(), tuple(args), ) ] def _open(self) -> None: """Open file, check magic number and read header""" # read 14 bytes: magic number, filesize, reserved, header final offset assert self.fp is not None head_data = self.fp.read(14) # choke if the file does not have the required magic bytes if not _accept(head_data): msg = "Not a BMP file" raise SyntaxError(msg) # read the start position of the BMP image data (u32) offset = i32(head_data, 10) # load bitmap information (offset=raster info) self._bitmap(offset=offset) class BmpRleDecoder(ImageFile.PyDecoder): _pulls_fd = True def decode(self, buffer: Image.DecoderInput) -> tuple[int, int]: assert self.fd is not None rle4 = self.args[1] data = bytearray() x = 0 dest_length = self.state.xsize * self.state.ysize while len(data) < dest_length: pixels = self.fd.read(1) byte = self.fd.read(1) if not pixels or not byte: break num_pixels = pixels[0] if num_pixels: # encoded mode if x + num_pixels > self.state.xsize: # Too much data for row num_pixels = max(0, self.state.xsize - x) if rle4: first_pixel = o8(byte[0] >> 4) second_pixel = o8(byte[0] & 0x0F) for index in range(num_pixels): if index % 2 == 0: data += first_pixel else: data += second_pixel else: data += byte * num_pixels x += num_pixels else: if byte[0] == 0: # end of line while len(data) % self.state.xsize != 0: data += b"\x00" x = 0 elif byte[0] == 1: # end of bitmap break elif byte[0] == 2: # delta bytes_read = self.fd.read(2) if len(bytes_read) < 2: break right, up = bytes_read data += b"\x00" * (right + up * self.state.xsize) x = len(data) % self.state.xsize else: # absolute mode if rle4: # 2 pixels per byte byte_count = byte[0] // 2 bytes_read = self.fd.read(byte_count) for byte_read in bytes_read: data += o8(byte_read >> 4) data += o8(byte_read & 0x0F) else: byte_count = byte[0] bytes_read = self.fd.read(byte_count) data += bytes_read if len(bytes_read) < byte_count: break x += byte[0] # align to 16-bit word boundary if self.fd.tell() % 2 != 0: self.fd.seek(1, os.SEEK_CUR) rawmode = "L" if self.mode == "L" else "P" self.set_as_raw(bytes(data), rawmode, (0, self.args[-1])) return -1, 0 # ============================================================================= # Image plugin for the DIB format (BMP alias) # ============================================================================= class DibImageFile(BmpImageFile): format = "DIB" format_description = "Windows Bitmap" def _open(self) -> None: self._bitmap() # # -------------------------------------------------------------------- # Write BMP file SAVE = { "1": ("1", 1, 2), "L": ("L", 8, 256), "P": ("P", 8, 256), "RGB": ("BGR", 24, 0), "RGBA": ("BGRA", 32, 0), } def _dib_save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None: _save(im, fp, filename, False) def _save( im: Image.Image, fp: IO[bytes], filename: str | bytes, bitmap_header: bool = True ) -> None: try: rawmode, bits, colors = SAVE[im.mode] except KeyError as e: msg = f"cannot write mode {im.mode} as BMP" raise OSError(msg) from e info = im.encoderinfo dpi = info.get("dpi", (96, 96)) # 1 meter == 39.3701 inches ppm = tuple(int(x * 39.3701 + 0.5) for x in dpi) stride = ((im.size[0] * bits + 7) // 8 + 3) & (~3) header = 40 # or 64 for OS/2 version 2 image = stride * im.size[1] if im.mode == "1": palette = b"".join(o8(i) * 3 + b"\x00" for i in (0, 255)) elif im.mode == "L": palette = b"".join(o8(i) * 3 + b"\x00" for i in range(256)) elif im.mode == "P": palette = im.im.getpalette("RGB", "BGRX") colors = len(palette) // 4 else: palette = None # bitmap header if bitmap_header: offset = 14 + header + colors * 4 file_size = offset + image if file_size > 2**32 - 1: msg = "File size is too large for the BMP format" raise ValueError(msg) fp.write( b"BM" # file type (magic) + o32(file_size) # file size + o32(0) # reserved + o32(offset) # image data offset ) # bitmap info header fp.write( o32(header) # info header size + o32(im.size[0]) # width + o32(im.size[1]) # height + o16(1) # planes + o16(bits) # depth + o32(0) # compression (0=uncompressed) + o32(image) # size of bitmap + o32(ppm[0]) # resolution + o32(ppm[1]) # resolution + o32(colors) # colors used + o32(colors) # colors important ) fp.write(b"\0" * (header - 40)) # padding (for OS/2 format) if palette: fp.write(palette) ImageFile._save( im, fp, [ImageFile._Tile("raw", (0, 0) + im.size, 0, (rawmode, stride, -1))] ) # # -------------------------------------------------------------------- # Registry Image.register_open(BmpImageFile.format, BmpImageFile, _accept) Image.register_save(BmpImageFile.format, _save) Image.register_extension(BmpImageFile.format, ".bmp") Image.register_mime(BmpImageFile.format, "image/bmp") Image.register_decoder("bmp_rle", BmpRleDecoder) Image.register_open(DibImageFile.format, DibImageFile, _dib_accept) Image.register_save(DibImageFile.format, _dib_save) Image.register_extension(DibImageFile.format, ".dib") Image.register_mime(DibImageFile.format, "image/bmp") |